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题型：单选题题类：真题难易度：普通

There are fewer and fewer tigers in India. The situation will continue ______ humans stop hunting them for their fur and bones.

A、if B、unless C、because D、since

举一反三

Mom, my classmates are waiting outside, __________ I must go now.

——Which do you prefer, tea _________ coffee?

——Tea, please.

—I want to be a teacher when I grow up.

—Work hard, _________ your dream will come true.

The book was so interesting that he had read it for three hours ______ he realized it.

_____ the car is very old, it still runs well.

Mark felt very bad today. __________, he kept working all day and said nothing about it.

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